Almost everything can be custom...

Custom kitchens, custom cars, even custom software, if there is something you need that is not "off the shelf" than it's also a given that there will be someone out there that can take the "ordinary" and make it exactly what you wanted. This is especially true when it comes to software, many businesses have special needs that can't be addressed easily by standard software and not every business can afford to have their own staff to be able to create software, it's not as easy as you might think...